4. Prepared a pan with cooking spray and pour the thick batter in. Spread it out to make it even. I think you can really use any size pan, to be honest. The larger the pan, the thinner the cake will be.

5. Slice the plums, removing the pit in the process.

6. Layer the plum wedges on top of the batter in a pretty pattern. You can use whatever pattern you want, or no pattern at all.

7. Mix together the sugar and cinnamon and sprinkle it over the plums.